This is a collection of internet sites I use to find vintage sheet music. I am no way affiliated with these sites, but use them as a valuable music resource. If you know of an on-line sheet music library that is not listed here please let me know and it may be included here.
(updated 12/11/19)
Cylinder Preservation and Digitization Project at the University of California, Santa Barbara
(a collection of cylinder recordings)
This is a great all in one spot with Midi and sheet music-
Duke University Digital Collection
Halcyon Days Music : complete lyrics, but no musical notations
IN Harmony : Sheet Music From Indiana
From the Heart of Texas Baylor University is a great place!
Ohioana Library : preserving the work of Ohio artists
John Hopkins University J Scholarship site
National Library Of Australia : Fabulous collection from down under
Songbook1 : At wordpress, there is unique historical and biographical information too.
University of South Carolina Sheet Music Collection